Definition of girder noun from the Oxford Advanced Learner's Dictionary

 

girder

 noun
noun
BrE BrE//ˈɡɜːdə(r)//
 
; NAmE NAmE//ˈɡɜːrdər//
 
Construction
 
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a long strong iron or steel bar used for building bridges and the framework of large buildings It was a confusing picture of pipes and girders. The unfinished building with its blue girders was being used as a huge climbing frame. Wordfindercement, construction, foundation, girder, joist, masonry, plaster, rubble, scaffolding, site See related entries: Construction Word Origin early 17th cent.: from gird in the archaic sense ‘brace, strengthen’.
See the Oxford Advanced American Dictionary entry: girder